Piston-rod packing



(No Mode-1.)

- J. LISTBR.

PISTON ROD PACKING.

No. 524,832.` Patentedug. 21,1894@ PATENT OFFICE.

JOSEPH LISTER, OF CHICAGO, ILLINOIS.

PlsToN-Roo PAoKiNG.

SPECIFICATION forming part of Letters Patent No. 524,832, dated August21, 1894. Application filed May 19, 1894. Serial No. 511,790. (Nomodel.)

.To @ZZ whom it may concern:

Be it known that I, JosEPE LIsTER, acitizen of the United States,residing at Chicago, in the countyof Cook and State of Illinois, havelnvented certain new and useful Improvements in Piston-Rod Packing; andIdo declare the following to bea full, clear, and exact description ofthe invention, such las will enable, others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

Figure 1 is a verticalsectional view of an engine cylinder and adjunctshaving my in'-V vention applied thereto. Fig. 2 is a side view of thepacking detached. Fig.3 is an end v1ew of the same. Fig. 4 is alongitudinal section.

The object of the invention is to provide a device which can be readilysubstituted for the ordinary stuffing-boxes employed in con` nectionwith piston rods, which shall be durable, easily applied andwithdrawn,which will permit an adjustment of the tightness of the packing, andwhich shall be inexpensive.

In the drawings, A represents a cylinder which may be ot' any of theordinary sorts. It contains a piston C, the rod C of which passesthrough the cylinder head B, the latter being detachably fastened bybolts as at b.

The head B has a central aperture, and around iton the exterior is thehub-like packing box b formed with an interior thread at b2.

It is necessary, as is well known, to provide a steam-tight joint for`the piston-rod C; and to attain this, many means have been employed, orsuggested heretofore.

The packing which I have devised consists of a tube having a cylindricalportion d4, a conical or tapering portion d with an intervening flangeor polygonal expansion D', these being yall castin one piece, indicatedat D.

The part d4 is provided with an exterior thread adapted to engage withthe thread at b2 in the packing-box, and it can be driven tightly intoplace by applying a wrench to the liange D so that the joint between thepacking and the cylinder-head shall be per fectly tight. t Y

Normallythe piston-rod can pass freely through the interior tubularpassage-way in the' packing, these parts being turned accurately so asto tit closely.

` A tter the packing tube has been put in place and the piston-rodpassed through it, the collar E is applied tothe conical or tapcringoutwardly projecting part d' of the packing. This collar Eis in thenature of a nut having an interior tapering thread corresponding inpitch and radius to that at d. The part d is made of a material whichshall be comparatively soft so as to be capable readily of uniformcompression and yet permit suiicient expansion radially when necessaryto allow for regulating the tightness of the joint betweenV it and thepiston-rod. For this purpose Babbitt-metal can be employed, or any otherwhich is suitable. The cylindrical part d4, the flange part D and theconical part d can be `all cast in one piece, and it will be seen thatthewhole packing device is made up of two parts.V i

VVhen the nut E is advanced along the cone CZ', the latter will beuniformly compressed, the interior cylindrical surface being pressedtoward the axis with its longitudinal lines in parallelism so as toeffect a packing over a prolonged surface and one which will be uniformin tension at all places around the center.

Iam aware of the fact that packings for this purpose have beenheretofore used or suggested, each ofwhich contained a tubular part `forsurrounding the piston-rod. But so far as I am aware, they were made inseveral pieces separated on radial planes. In my case the tubularportion is continuous entirely around the axis, so that I avoid entirelythe possibility of leakage, and overcome any tendency to unevenness ofcornpression radially and at the same time provide, as above stated, fordriving the packing surface inward uniformly over a prolonged area.

The herein described packing device for a 5 piston-trod, having thecylindrical threaded part d4, the conical or tapering threaded part d',and the lzingev D integral with the parts d4, d and provided with theinterior tubular opening adapted to t the piston-rod,`in com- 1obination with the nut or collar E having an

